:root{--moss-green:#5a7247;--moss-light:#7a9465;--moss-dark:#3d5030;--sand:#e8dcc4;--sand-light:#f5efe3;--sand-dark:#d4c4a8;--stone:#8b8680;--stone-light:#a8a49e;--bark:#5c4a3d;--cream:#faf8f5;--warm-white:#fffef9;--text-primary:#3d3a36;--text-secondary:#6b6560;--text-muted:#9a948d;--text-light:#faf8f5;--shadow-soft:0 2px 8px #5d4a3d14;--shadow-medium:0 4px 16px #5d4a3d1a;--shadow-large:0 8px 32px #5d4a3d1f;--ease-natural:cubic-bezier(.4, 0, .2, 1);--duration-fast:.18s;--duration-normal:.22s;--radius-sm:6px;--radius-md:12px;--radius-lg:20px;--radius-xl:28px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{color:var(--text-primary);background:var(--cream);min-height:100vh;font-family:Nunito,-apple-system,BlinkMacSystemFont,sans-serif;font-size:16px;line-height:1.7}.texture-overlay{pointer-events:none;z-index:9999;opacity:.03;background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter 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no-repeat,linear-gradient(135deg,#a25b43db,#a25b43db) 100% 0/33.333% 66.666% no-repeat,linear-gradient(135deg,#526b45e6,#526b45e6) 0 100%/66.666% 66.666% no-repeat,#e7dcc9;grid-template-rows:repeat(3,1fr);grid-template-columns:repeat(3,1fr);display:grid;overflow:hidden}.grid-demo__cell{color:#fff;border:1px solid #ffffffbf;place-items:center;font-size:.82rem;font-weight:700;display:grid}.grid-demo__caption{color:var(--text-secondary);justify-content:space-between;gap:1rem;margin-top:1rem;font-size:.88rem;display:flex}.guide-grid{border:1px solid var(--line);background:var(--line);border-radius:8px;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;display:grid;overflow:hidden}.guide-card{background:var(--paper-strong);min-height:260px;color:var(--ink);padding:1.75rem;text-decoration:none;transition:background .18s}.guide-card:hover{background:var(--lake-light)}.guide-card__meta{color:var(--text-muted);text-transform:uppercase;justify-content:space-between;gap:1rem;margin-bottom:2.5rem;font-size:.78rem;font-weight:700;display:flex}.guide-card h3{max-width:430px;margin-bottom:.75rem;font-family:Playfair Display,Georgia,serif;font-size:1.45rem;line-height:1.25}.guide-card p{color:var(--text-secondary)}.guide-card__action{color:var(--lake);margin-top:1.25rem;font-weight:700;display:inline-block}.method-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:2rem;display:grid}.method-item{border-top:3px solid var(--line);padding-top:1rem}.method-item:first-child{border-color:var(--moss)}.method-item:nth-child(2){border-color:var(--lake)}.method-item:nth-child(3){border-color:var(--clay)}.method-item strong{color:var(--ink);margin-bottom:.55rem;font-size:1.05rem;display:block}.method-item p{color:var(--text-secondary);font-size:.94rem}.calculator-shell{grid-template-columns:minmax(0,.95fr) 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var(--line);min-height:38px;color:var(--text-secondary);font:inherit;cursor:pointer;background:#fff;border-radius:5px;padding:.45rem .7rem;font-size:.84rem;font-weight:700}.preset-btn:hover{border-color:var(--lake);color:var(--lake)}.result-summary{border:1px solid var(--line);background:var(--line);border-radius:6px;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;margin-bottom:1.25rem;display:grid;overflow:hidden}.result-stat{background:#fff;padding:1rem}.result-stat span{color:var(--text-muted);text-transform:uppercase;margin-bottom:.2rem;font-size:.75rem;font-weight:700;display:block}.result-stat strong{color:var(--ink);font-size:1.15rem;display:block}.result-note{border-left:4px solid var(--lake);background:var(--lake-light);color:#31595c;border-radius:0 5px 5px 0;padding:1rem;font-size:.92rem}.result-note--warning{border-color:var(--clay);background:var(--clay-light);color:#764331}.preview-grid{aspect-ratio:1;border:1px solid var(--ink);background:#e8e0d4;max-width:360px;margin:1.5rem auto 0;display:grid;overflow:hidden}.preview-grid__cell{background:var(--moss);color:#fff;border:1px solid #fffc;place-items:center;min-width:0;min-height:0;font-size:.7rem;display:grid}.data-table-wrap{border:1px solid var(--line);border-radius:6px;margin:1.5rem 0;overflow-x:auto}.data-table{border-collapse:collapse;width:100%;min-width:620px}.data-table th,.data-table td{border-bottom:1px solid var(--line);text-align:left;padding:.8rem .9rem}.data-table th{color:var(--ink);background:#eee9e1;font-size:.82rem}.data-table td{color:var(--text-secondary)}.data-table tr:last-child td{border-bottom:0}.formula{border:1px solid var(--line);color:var(--ink);overflow-wrap:anywhere;background:#f4f1ec;border-radius:6px;margin:1.5rem 0;padding:1.25rem;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.92rem}@media 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